https://blog.jooq.org/2014/11/11/have-you-ever-wondered-about-the-difference-between-not-null-and-default/ When writing DDL in SQL, you can specify a couple of constraints on columns, like NOT NULL or DEFAULT constraints. Some people might wonder, if…

https://www.unix.com/shell-programming-and-scripting/125947-difference-between-dev-null-2-1-2-1-dev-null.html https://superuser.com/questions/1179844/what-does-dev-null-21-true-mean-in-linux https://stackoverflow.com/questions/23489934/echo-2-some-te…

本文内容摘自MySQL5.6官方文档,主要选取了在实践过程中所用到的部分文字解释,力求只摘录重点,快速学会使用MySQL,本文所贴代码地方就是我亲自练习过的代码,凡本文没有练习过的代码都没有贴在此处,如果读者想自己尝试,可以查看官方文档,文中给出了原官方文档的对应链接以供查阅. 本文地址:http://www.cnblogs.com/yhLinux/p/4019386.html http://dev.mysql.com/doc/refman/5.6/en/tutorial.htmlThis ch…

Commons-configuration   Commons-FileUpload   Commons DbUtils   Commons BeanUtils  Commons CLI  Commons Codec   Commons Collections Commons DBCP    Commons HttpClient  Commons IO  Commons JXPath   Commons Lang   Commons Math   Commons Net   Commons Va…

分析libevent的源代码,我的想法的是先分析各种结构体,struct event_base.struct event,然后是event_base_new函数.event_new函数.event_add函数,最后分析event_base_dispatch函数. 一.各种结构体 1.event_base struct event_base { /** Function pointers and other data to describe this event_base's * backend.…

mysql包相关命令行工具 [root@manage ~]# rpm -qa|grep mysql mysql-server-5.1.73-5.el6_7.1.x86_64 mysql-5.1.73-5.el6_7.1.x86_64 mysql-connector-java-5.1.17-6.el6.noarch mysql-libs-5.1.73-5.el6_7.1.x86_64 [root@manage ~]# rpm -ql mysql /usr/bin/msql2mysql 没多大用 /…

High Performance My SQL, Third Edition Date and Time Types My SQL has many types for various kinds of date and time values, such as YEAR andDATE. The finest granularity of time My SQL can store is one second. (Maria DB hasmicrosecond-granularity temp…

nohup  platanus assemble -o Larrrea -f ../unknown_NoIndex_L000_R1.fastq ../unknown_NoIndex_L000_R2.fastq -t 10 -m 150 & -o 输出文件头的名字 -f 你的序列文件 -t 线程数 -m 最大内存数 platanus assemble/scaffold/gap_close Platanus version: 1.2.1 Usage platanus assemble [Option…

以下内容参考官方文档:http://dev.mysql.com/doc/refman/5.7/en/windows-start-command-line.html 解压缩zip到D:\mysql-5.7.13-winx64,建立data目录D:\mysql-5.7.13-winx64\data, 在D:\mysql-5.7.13-winx64创建配置文件my.ini,详见: [mysqld] # set basedir to your installation path basedir=D:\m…

GDataXMLNode .好东西,处理xml 在iOS 中使用.可以编辑和读取Xml文档.支持Xpath.这个很好. GDataXMLNode.h GDataXMLNode.m 文件很不好找啊. /* Copyright (c) 2008 Google Inc. * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compli…